Improvement in wood-pavbment



tnitcd States ALBERT BETTELEY, OF BOSTON, MASSACHUSETTS.

Lemrs'pmm No.1o7,152, daad september 6, 1st-c.

IMPROVEMENT IN VWOOD-PAIVII'MENT.y

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

able those skilled in the art to practice it.

This invention relates to a peculiar construction of' pavement which is formed or made up of blocks, which are grooved conic frustums, so placed, with respect to `each other, that the large euds of some ofthe frustums are placedon the road bed with their small ends uppermost, while between the frustums so located and in the intel-spaces left between tliem,aied1iveu other couic frnstums with their small ends down and their large ends uppermost, so as to key the whole pavement firmly between the edge and crossing-stones.

The smaller iuterspaces, then left, are lilled preferably with semi-duid cement grouting, which finds its way into the grooves made in the blocks, and harde-ning in said grooves and small interstices left in the pavement, keeps the frustmns, which areplaced small end do'wu, from rising above the generally level or convex surface of the pavement.

Instead of the cement grouting said grooves and interspaces may be h'lled with other suitable material made Huid by heat, which will harden upon cooling, or will set on absorption or evaporation of the tluid with which it is mixed, or sand, or tine gravel, or other suitable granular material may be worked or puddled into the said grooves for the same purpose for which I prefer to employ the cement grouting.

Thedrawings show in perspectivea group of blocks placed together as in my improved pavement.

u a a a represent the conic frustums which have their large ends resting on the road bed, and

b b b b b represent those which are driven between a a a a, wt-h their small ends down. The grooves in said pavement-blocks are marked c, and may he as many iu number as may be deemed requisite, and the form of the grooves may be varied as required.

The angle or taper of' all the blocks in the pavement should be similar, so that all along the lengths of' the oppositely-arranged blocks there shall be lines of' support-ing contact, broken only where .the blocks are grooved. v

In practice I make the pavement-blocks of young lwood, preferably of locust or chestnut, and about eight inches iu length, forming one set of' blocks, a a, which are to have their large ends resting on the road bed of a diameter at the lower and upper ends, respecttively, about six and five inches, and the other set of blocks b b, vwith diameters ot' three and two inches, though of course these dimensions may be departed from.

Apavement made up of blocks, which are conic frustums, grooved and grouped together. and lockedby ll ing occupying the grooves in .the blocks and the interspaces between the blocks, substantially as described.

ALBERT BETTELEY.

Witnesses:

J. B. CROSBY, R. H. FITCH. 

